Assorted CSS doc glitches [GEOS-6211]

http://jira.codehaus.org/browse/GEOS-6211
PostGSI doco -primary key WFS-T restrictions, and mention multi-line labels

https://jira.codehaus.org/browse/GEOT-4719
GEOS-6381 Missing user roles if using Authkey Authentication Filter
Updated WPS section of developer to reflect current state of code.

- Using non deprecated classes
- Updated version numbers
Footprint doc
Minor fixes on footprint documentation
[GEOS-5511] Help icons on various GWC pages do nothing (icons removed, they have been confusing users long enough)
Whoops, last commit left some tags unbalanced and broke the build
Providing better logging when fallback on embedded data directory occurs.

Fixes GEOS-6408.
upgrade to guava 14.0.1.

It has the jsr305 (javax.annotations) dependency as transitive
now so we have to declare it explicitly.
This is mainly to coordinate the dependency version with downstream projects.